West Branch Susquehanna River at Lewisburg, Northumberland County PA (LWBP1)
Gage Location: Northumberland County, Pennsylvania	Site Location: Union County, Pennsylvania
Latitude: 40.968	Longitude: -76.876	Elevation: 428.2 ft. MSL	Drainage Area: 6847 Sq. Mi.
Minor Stage: 18 ft.	Moderate Stage: 23 ft.	Major Stage: 28 ft.
First Flood: 1865-03-17	Last Flood: 2011-09-08 Crest: 25.91 ft.	Datum change: 1940-07-02	Number of Floods: 39

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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1865-03-17 26.5 -9999 Moderate *** 1889-06-01 29.8 -9999 Major *** 1894-05-21 28.5 -9999 Major *** 1902-03-01 22.3 -9999 Minor *** 1909-05-01 19.5 -9999 Minor *** 1936-03-19 32.1 287000 Major *** 1940-04-01 22.7 164000 Minor *** 1942-05-23 18.57 117000 Minor none 1942-12-31 22.47 151000 Minor none 1946-05-29 28.43 262000 Major none 1948-04-15 20.07 132000 Minor none 1950-03-30 18.15 107000 Minor none 1950-11-26 26.05 216000 Moderate none 1952-03-12 18.08 112000 Minor none 1954-03-03 18.51 118000 Minor none 1956-03-09 19.8 121000 Minor none 1956-11-03 18.6 118000 Minor none 1959-01-23 18.22 115000 Minor none 1960-04-01 21 134000 Minor none 1961-02-27 21.17 139000 Minor none 1964-03-11 26.16 210000 Moderate (1) 1972-06-24 34.23 300000 Major (1) 1975-09-27 27.62 242000 Moderate (6) 1979-03-06 23.44 165000 Moderate (1) (6) 1981-02-24 18.83 123000 Minor (1) (6) 1982-02-03 19.82 -9999 Minor (1) (6) 1984-02-15 24.26 192000 Moderate (1) (6) 1986-03-15 18.61 112000 Minor (1) (6) 1993-04-02 21.33 146000 Minor (6) 1994-03-26 18.28 111000 Minor (6) 1996-01-20 25.94 205000 Moderate (6) 1998-01-09 18.83 118000 Minor (6) 2004-09-19 26.01 209000 Moderate (1) (6) 2005-04-03 18.79 113000 Minor (6) 2010-01-26 19.03 114000 Minor none 2010-12-02 20.9 142000 Minor none 2011-03-11 20.78 122000 Minor none 2011-04-29 20.1 113000 Minor none 2011-09-08 25.91 165000 Moderate none

MARFC Codes
Code Description
(!!!) Datum changed during this year.
(1) Backwater Effect.
(2) 15.77 ft also occurred on 11/25/1950 but only counted as one flood.
(3) Estimated from currrent USGS rating table.
(4) Estimated height from the USGS.
(5) Gage height at a different site and/or datum
(6) Discharge affected by Regulation or Diversion
(7) Due to changes, prior floods were based on present flood stage. Therefore, flood data could possibly be incomplete.
(8) Gage is a staff gage and not the offical USGS gage. Therefore, some floods may be missing from our study.
(9) Discharge effected by snow-melt, ice jam or debris jam break up
(A) Discharge affected to unknown degree by regulation or diversion.
(B) Month or day of occurrence is unknown or not exact.
(C) All or part of the record affected by urbanization, mining, agricultural changes, channelization, or other factors.
(D) Crest height adjusted to current datum.
(E) Estimated discharge.
(F) Only annual maximum peak available for this year.
(O) This flood occurred at a previous flood stage that is lower than the current flood stage. This is only a historical flood.
** Crest information looks reasonable despite potential problems. This data was used in our study.
*** Crest information looks unreliable and incomplete and was not used in our flood frequency study.
**** Gauge was discontinued in 2004. 2004 and later was not used in our study.
none No code

Updated: 08:58 AM Jun 28, 2012